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Best DOI Helper Alternatives
Here are some Firefox add-ons that are similar to DOI Helper:
Sci-Hub in Google Scholar
snlned
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(4) 
Sci-Hub Linker
JPH
13 5.00 (2) 
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sci-hub
patztablook22
162 3.00 (4) 
Go to Sci-Hub
soheil sabz
89 4.80 (5) INSPIRE-HEP Lookup
Cole Faraday
1 0.00 (0) 
Sci-Hub-It by Aristotle v0.2.1
Aristotle
11 5.00 (2) 
Sci-Hub DOI
Alexandr Vasilyev
441 4.29 (7) Sci-Hub Direct Access
Tunswi
1 0.00 (0) Go to sci-hub
adareau
- 0.00 (0) Download via Sci-Hub by Aristotle
Aristotle
- 0.00 (0) 
Sci-Hub
CNico
4K 4.71 (21)